/**
 * Copyright (C) 2007 The AsyncMail Group <asyncmail@googlegroups.com>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *         http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.asyncmail.smtpserver.handler;

import org.springframework.beans.factory.annotation.Required;

import com.googlecode.asyncmail.smtp.SMTPResponseImpl;
import com.googlecode.asyncmail.smtp.SMTPRetCode;
import com.googlecode.asyncmail.smtpserver.SMTPSession;
import com.googlecode.asyncmail.smtpserver.core.ConnectHandler;

import java.util.Date;

import javax.mail.internet.MailDateFormat;

/**
 * This ConnectHandler print the greeting on connecting
 */
public class WelcomeMessageHandler implements ConnectHandler {

    /**
     * SMTP Server identification string used in SMTP headers
     */
    private final static String SOFTWARE_TYPE = "Our SMTP Server";

    /**
     * Static RFC822DateFormat used to generate date headers
     */
    // private final static RFC822DateFormat rfc822DateFormat = new
    // RFC822DateFormat();
    private final static MailDateFormat rfc822DateFormat = new MailDateFormat();

    private String smtpGreeting;

    /**
     * @see com.googlecode.asyncmail.smtpserver.core.ConnectHandler#onConnect(SMTPSession)
     */
    public void onConnect(SMTPSession session) {
        String smtpGreeting = getSmtpGreeting();

        SMTPResponseImpl welcomeResponse;
        // if no greeting was configured use a default
        if (smtpGreeting == null) {
            // Initially greet the connector
            // Format is: Sat, 24 Jan 1998 13:16:09 -0500
            welcomeResponse = new SMTPResponseImpl(SMTPRetCode.SERVICE_READY,
                    new StringBuffer(256).append(
                            session.getConfigurationData().getHelloName())
                            .append(" SMTP Server (").append(SOFTWARE_TYPE)
                            .append(") ready ").append(
                                    rfc822DateFormat.format(new Date())));
        } else {
            welcomeResponse = new SMTPResponseImpl(SMTPRetCode.SERVICE_READY,
                    smtpGreeting);
        }
        session.writeSMTPResponse(welcomeResponse);
    }

    /**
     * Return the SMTPGreeting which should used.
     * 
     * @return the SMTPGreeting
     */
    private String getSmtpGreeting() {
        return smtpGreeting;
    }

    @Required
    public void setSmtpGreeting(String smtpGreeting) {
        this.smtpGreeting = smtpGreeting;
    }

}
